AD7492BRUZ referencing

Hi!

The AD7492 datasheet says that the internal 2.5 V reference is available for external referencing. The EVAL-AD7492SDZ User Guide showing the connection of REF OUT with +input of the AD8021AR what have typical Input Bias Current 7.5 uA.
I want to connect the voltage divider (750 kOhm+32 kOhm) to the output REF OUT of the AD7492BRUZ and join the midpoint of the divider with a non-inverting input of the AD8066. Could this load affect the AD7492BRUZ?

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    •  Analog Employees 
    on May 8, 2017 12:41 AM over 3 years ago

    Hi Regwer,

          

       The AD8021 in the AD7492 evaluation board is buffered to connect to external circuit and this will give enough current drive to  the external circuit. Do you mean putting a resistor a 75Kohm and 32Kohm between REFOUT and AD8021? Where is AD8066 connected? If you have a schematic to have a better understanding, please share.

     

    Regards,

    Jonathan

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  • 0
    •  Analog Employees 
    on May 8, 2017 12:41 AM over 3 years ago

    Hi Regwer,

          

       The AD8021 in the AD7492 evaluation board is buffered to connect to external circuit and this will give enough current drive to  the external circuit. Do you mean putting a resistor a 75Kohm and 32Kohm between REFOUT and AD8021? Where is AD8066 connected? If you have a schematic to have a better understanding, please share.

     

    Regards,

    Jonathan

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